Bulletin . B. TYPICAL GRAPHIC GRANITES, SHOWING VARIATION IN SIZE OF C. APPEARANCE OF CONES AFTER DEFORMATION. FELDSPAR DISTRICTS. 11 minerals that no miner would attempt to work the lenses for theirfeldspar alone. In the search for gems, which are found chiefly inthis type of formation, much feldspar has been exposed and fromtime to time this has been removed and has added considerably tothe feldspar production of the district. The feldspar of thesedeposits is a pale buff microcline and a milk-white albite. OTHER DEPOSITS. There are many small dikes of pegmatite in the State of Mai
Bulletin . B. TYPICAL GRAPHIC GRANITES, SHOWING VARIATION IN SIZE OF C. APPEARANCE OF CONES AFTER DEFORMATION. FELDSPAR DISTRICTS. 11 minerals that no miner would attempt to work the lenses for theirfeldspar alone. In the search for gems, which are found chiefly inthis type of formation, much feldspar has been exposed and fromtime to time this has been removed and has added considerably tothe feldspar production of the district. The feldspar of thesedeposits is a pale buff microcline and a milk-white albite. OTHER DEPOSITS. There are many small dikes of pegmatite in the State of Maine,which are not included in these districts, but they do not differ mate-rially from the feldspars recorded. Throughout the State of Mainea remarkable uniformity prevails both in the potash and the sodafeldspars. ANALYSES OF MAINE FELDSPARS. Samples of potash feldspar taken from various deposits, fromsouth to north across the State, show the following analyses: Analyses of potash feldspars of Maine.[A. C Fieldner, analyst.] Constituent. A B c D E Si02 Per cent.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
